Last updated: June 2026.

What HAZWOPER Covers (at a Glance)

HAZWOPER comes from OSHA's standards for hazardous waste operations and emergency response, 29 CFR 1910.120 for general industry and 1926.65 for construction. It applies to certain cleanup, corrective actions, and emergency response activities where workers could be exposed to hazardous substances. Employers determine who needs training based on a hazard assessment of tasks, sites, and potential exposures.

Common examples include hazardous waste sites, treatment or storage facilities, and organizations that maintain emergency response teams for chemical releases.

Who Typically Needs HAZWOPER

• General site workers at hazardous waste operations or similar cleanup sites
• Occasional site workers with limited exposure potential
• Supervisors and managers with responsibility over covered operations
• Emergency response personnel involved with hazardous substance releases

If you are not sure which group your workers fall into, many employers start with a 24 vs 40-Hour comparison and then confirm with their safety consultant or health and safety manager.

Required Training Hours by Role

The training paragraphs of the standard set minimum hours by duties and exposure, not by personal preference. The table below summarizes the worker and supervisor levels, with the matching paragraph in the eCFR text of 29 CFR 1910.120.

Role	Initial training	Supervised field experience	Annual refresher	OSHA paragraph
General site worker (40 hour)	40 hours	3 days	8 hours	(e)(3)(i)
Occasional or limited-task worker (24 hour)	24 hours	1 day	8 hours	(e)(3)(ii)
Regularly on site, low exposure (24 hour)	24 hours	1 day	8 hours	(e)(3)(iii)
On-site supervisor or manager	Worker level plus 8 additional hours	Per worker level	8 hours	(e)(4)

24-Hour HAZWOPER (Occasional or Limited-Task Workers)

Commonly selected for workers who visit or perform limited tasks at hazardous waste sites with lower risk of exposure, covered by paragraphs (e)(3)(ii) and (e)(3)(iii). Employers also provide site-specific instruction and supervision appropriate to the work.

See the 24-Hour HAZWOPER course page for a full syllabus, OSHA references, and current pricing.

40-Hour HAZWOPER (General Site Workers)

Used for workers who perform ongoing duties at hazardous waste operations where exposure potential is higher, covered by paragraph (e)(3)(i). Training covers topics such as hazard recognition, PPE, decontamination, and emergency procedures. As with all HAZWOPER training, employers must add site-specific instruction and ensure competent supervision.

See the 40-Hour HAZWOPER course page for detailed curriculum and enrollment options.

8-Hour Supervisor / Manager

Under paragraph (e)(4), supervisors over HAZWOPER operations complete the same initial level as the workers they oversee (24- or 40-hour as appropriate) plus at least 8 additional hours of specialized training. This supervisor training focuses on responsibilities such as implementing the site safety and health plan, assigning work, and verifying that controls are in place.

For more information, see our 8-Hour HAZWOPER Supervisor course, which also covers the supervisor refresher details.

8-Hour Annual Refresher

Under paragraph (e)(8), all covered workers and supervisors complete an 8-hour refresher each year to maintain currency. If you miss it, complete it as soon as possible and follow your employer's policy for making up training. Document the lapse and the date training was completed.

You can complete the online knowledge portion through our 8-Hour HAZWOPER Refresher course, and your employer can add any site-specific or hands-on elements they require.

Real-World Examples

• Land surveyor at a former industrial site: On site briefly to take measurements and unlikely to exceed exposure limits. The 24 Hour level fits, matching paragraph (e)(3)(ii).
• Remediation technician at a Superfund cleanup: Excavating contaminated soil with regular exposure and respirator use. The 40 Hour level is required, matching paragraph (e)(3)(i).
• Driver reassigned to site work: A driver trained to 24 hours who is later assigned general site duties, or required to wear a respirator, must add 16 hours and two days of field experience to reach the 40-hour level, per paragraph (e)(3)(iv). Confirming the right level up front avoids this rework.

Site-Specific and Hands-On Training

Online courses can cover the knowledge portion of HAZWOPER, but OSHA expects employers to build on that with training that is specific to the worksite and the job. This usually includes:

• Site layout, access control, and decontamination areas
• Work practices, SOPs, and job-specific hazards
• Personal protective equipment (PPE) selection, use, and limitations
• Equipment such as monitoring devices, pumps, and containment tools
• Emergency procedures, alarms, evacuation, and medical response

Employers must also ensure any required hands-on practice or supervised field experience appropriate to the job, especially for workers who will wear respiratory protection or work directly with hazardous substances.

Medical Surveillance (When It Is Typically Required)

Medical surveillance under paragraph (f) helps verify that employees can safely perform HAZWOPER work. Employers arrange medical evaluations when job conditions warrant them, such as:

• Ongoing or potentially significant exposure to hazardous substances
• Membership on a hazmat team or emergency response unit
• Frequent or routine use of respirators
• After potential overexposures, spills, or symptoms related to chemical exposure

Requirements follow the OSHA standard and the guidance of a licensed healthcare provider familiar with the work.

Documentation and Recordkeeping

Good records make compliance audits easier and help employers plan refresher training. Typical HAZWOPER training records include:

• Course title, provider, hours completed, and completion date
• Topics covered and method of evaluation, as applicable
• Certificates for each employee
• Employer site-specific training records and sign-in sheets

Employees should keep their own certificates as proof of training when moving between sites or employers.

State Plan Differences

States with OSHA-approved plans may have additional requirements or guidance. If you work in a state-plan state, confirm any state-specific rules and resources here:

HAZWOPER Training by State: links to state agencies and state-level expectations where available.

What Undertraining Costs Employers

Frequently Asked Questions

Who needs HAZWOPER training?

Under OSHA 29 CFR 1910.120, workers and supervisors who may be exposed to hazardous substances during hazardous waste cleanup, corrective actions, or emergency response typically need HAZWOPER training. The employer uses a hazard assessment to decide which employees fall under the standard and what level of training they need.

What is the difference between 24-hour and 40-hour HAZWOPER?

24-hour HAZWOPER is usually used for occasional site workers and limited-task personnel with lower exposure potential. 40-hour HAZWOPER is for general site workers who regularly work on or near hazardous waste sites with higher exposure potential. Supervisors complete these worker hours plus additional supervisor training.

How often is the HAZWOPER refresher required?

OSHA requires an 8-hour HAZWOPER refresher annually for covered workers and supervisors. If the refresher is missed, it should be completed as soon as possible, and the employer should document how the training lapse was handled.

Does online HAZWOPER meet OSHA requirements?

Online HAZWOPER courses can satisfy the knowledge portion of the OSHA standard when they are properly designed. Employers are still responsible for site-specific instruction, supervision, and any required hands-on training or field experience so employees can safely perform their assigned duties.

What HAZWOPER training records should employers keep?

Employers should keep training records showing the course title, provider, dates, hours, topics covered, method of evaluation, and trainee names. Employees should keep copies of their certificates. These records document OSHA compliance and make refresher scheduling easier.

Related Guides

• What Is HAZWOPER Training?
• How to Get HAZWOPER Certified Online
• Does HAZWOPER Certification Expire?
• HAZWOPER Near Me

Ready to Start Your HAZWOPER Training?

Enroll online through our secure training portal, learn at your own pace, and download your certificate as soon as you finish. Your employer can then complete the site-specific and hands-on pieces required by OSHA.

Enroll in 24-Hour HAZWOPER Enroll in 40-Hour HAZWOPER Still deciding? Read the 24 vs 40 guide

Published by HazMat Student, providing OSHA HAZWOPER training since 2007. About HazMat Student.